<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Untitled Page</title>
    <script>
    function cuadrado()
    {
    var x = Text1.value;
    
    //DEclaracion de la variable  local
    
    document.write((x*x));
    }
    </script>
</head>
<body>
    Calcular
    <input id="Text1" type="text" /><br />
    <input id="Button1" type="button" onclick="cuadrado()" value="button" />

</body>
</html>
